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ANDREW PeULsjeN, or tionen annum, NEARV WIDNES, AND WILLIAM CHARLES, AUGUSTUS MATE, or eAJasTANe, ENGLAND, ASsIGNoRs 'ro cnAaLns Josera mienne, or ennAnLnnULnn, MANCHESTER, ENGLAND.

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narrati.'

Specification of Letters Patent.

Patenten sary ae,

Application led October 15, 1917. Serial Ho. 196,751;

/ To all inkom t may concern:

Furnaces or Cupolas, of which the follow-V ing is a' specification.

This invention relates to improvements in smelting furnaces or cupolas for metal and is designed to provide means whereby the forced draft shall be so directed through the twyers that a more eicient heating'of the furnace contents-shall be effected than in metal smelting furnaces of the present4 types. s

According to this invention the furnace or cupola is provided with an annularA chamber, preferably exterior to the wall of the cupola, into which chamber is directed the forced draft from the blowing engineV of any usual type, the inlet to this chamber from the blowing-engine being preferably disposed' tangentially. That portion of the y cupola wall which is embraced by the annular chamber is perforated with a series,

say, four, of twyer holes which lead from the chamber to the ,interior of the cupola.

These twyer holes insteadvof being radially disposed .in the usual manner, `are ar ranged somewhat tangentially to the interior of the cupola and ar; preferably 'slightly curved in plan, so tht the air as it passes from the annular hamber fed from the blowing engine,- is directed along the interior wall of the cupolaJ in a series of tangential blasts and sets u'p an eective combustion throughout the zone of the Y twyer holes, thus producing an equally heated melting zone. The disadvantage of the usual system of. radially directed 4twyer holes, lies in the fact that the blastbe'comes concentrated at the center of the furnace and while the temperature at that point is maintained suiciently high, a peripheral zone vof comparatively dead fuel remains. lying around'this central zone. With an arrangement of tangential twyer holes in accordanbe with this invention such a localized center'of heat is avoided. Means are also provided for heating the blast entering the annular chamber by` tting vthe blast yinlet with Ja ticket into which is led a portion oli the Aet gases from the cupola, and arrangements may be provided for causing the hot Lgases to traverse the jacket through` a circuit/ous path and for inducing their How 'therethrough.

A smelti'ng furnace or cu ola in accord ance with thisinvention is il. ustrated the accompanying drawings, in which Figure shows a cupola partly in section and arrangement for supplyingthe blast there to, Fig. 2 being `a plan view in section on the line A. A. of Fig. l., and Fig. 3, averti-l A cal section showing the pipe' connection be tween the stack and the jacket which sur rounds the blast pipe.

or cupola l is provided, having an annular chamber2 exterior to the wall of the cupola,-

In carrying out thev invention a furnace into lwhich chamber is directed the orced draft from the bl wing1 engine (not shown) .by way of a trunk pipe ll, the inlet of the 'trunk ipe to the chamber 2 being preferably isposed tangentia-lly. The annular chamber 2 is provided at one side of the draft inlet 5, withA a-separate wall or partisomewhat tangentially to the interior Awall of the cupola, and are vpreizerably slightly curved in plan, as shown` so that rice air, subdivided into a series ot tangenti'ally directed blasts, is delivered around the periphery of the cupola interior and sets .up an eective combustion throughout'the zone of the twyer'holes 7, thus producing an equally heatedY smelting zone and avoiding the comparatively dead outer zone of fuel as in the usual arrangement. 4 y

By arranging that the twyer holes are supplied from a common annular chamer, the air pressure from the blowing ent is equally distributed-through all the twyers, a fall in the blast air pressure being thus obviat'ed and a better smelting eiiciency achieved in the furnace. Further, by reason of delivering the air tangentially and the consequent high temperature in the peripheral inner wall of the cupola, any clogging up of the inner or delivery nozzle of the twyers is avoided.

In order t0 insure that there shall be no drop of pressure in the blast from the blowing engine to the twyers, the cross sectional area of the annular chamber is made at least equal to the bore of the trunk pipe 4, and the aggregate cross sectional area of the series of twyers is also made equal, or'approximately so, to the sectional area of the chamber vand of the trunk pipeJl.

In order to increase the eiciency of the furnace, a branch outlet 8 is led from the interior 4of the cupola 4and from a point slightly above the zone of the tWyers to -a jacket 9, surrounding the blast inlet and a considerablel portion of the trunk pipe, a portion of the hot gases from the cupola being led by the pipe 8 to this jacket which serve to heat thev blast passing through the trunk pipe. Baiies 8 are arranged in the jacket to lengthen t l1e path of travel of the gases through the acket, thus increasing the timeof Contact of the gases and securing a better heating eiciency of the air blast, and in order to insure a positive flow of hot gases through such lengthened path and in a direction opposite to the inflow of air, an ejector nozzle l0 is fitted in the outlet pipe 10 of the jacket, such an ejector nozzle being fed by a branch pipe from a blowing engine (not shown).

The annular chamber 2 surrounding the cupola may be built up of sheet metal as shown, and be provided with inspection doors ll for giving access to the twyer holes 7, so to enable them to be readily cleaned of any deposit that may lodgev therein.

` 1. A smelting furnace or cupola compris-v ing, a chamber surrounding the cupola and having a blast'inlet, a series oftwyer holesv leading from the chamber tangentially into the furnace, and a partition in the chamberdisposed directly at one side of the blast inlet and between adjacent twyer holes.

2. A smelting furnace or cupola, comprising; a chamber surrounding the. cupola to which the blast is delivered, a series of tWyer holes leading from the chamber tangentially into the furnace, a jacket surrounding the blast inlet to the chamber to which jacket a portion of the hot gases from the cupola isled, and means for positively inducing the flow of hotgases through the jacket in a direction opposite to that of the l air blast.

' 3. A smelting furnace or cupola, comprising; a chamber surrounding the cupola to which the blast is delivered, la series of twyer holes leading from the chamber tangentially into the furnace, a jacket surrounding the blast inlet to the chamber to 'which jacket a portion of the not gases fromv the cupola is lcd, and baffles in the jacket for lengthening the path of the hot gases therethrough. l

In testimony whereof We aiiix our signatures in presence of two Witnesses.

Witnesses:

ERNOLD S. MosELEY, MANSUR (JLOUD. 

